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TB Parts

88cc V2 Race Head Big Bore Kit - CRF50 XR50 CRF70 XR70 Z50 - TBW9105

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  • $ 599.99



We've stood behind these products 100% since we opened in 2005. Best reviews received for a big bore kit hands down!


NEW! Roller Rocker V2 Race Head Performance Kit:
TB Parts 88cc (52mm) V2 Race Head Big Bore Kit.
This kit converts a stock 50 and 70 to 88cc.




Includes the following:



- 52mm high compression piston with rings, pin, & clips
- Head gasket kit and clutch cover gasket.
- High performance race camshaft (for the V2 Race Head only)

- Has Roller Rocker Arms exactly like the V2 head for the KLX110
- 28.5mm intake Valve
- 23.5mm Exhaust Valve
- 5mm Valve Stem
- 26mm Intake Port (Matches Intake Manifold Kit TBW0433)
- 23mm Exhaust port
- All pistons in the kits are new and have CNC machined piston domes
- Head kits include all hardware
- Head kits Include all covers (Billet Dress up kits and Breathers will be available later)

- Includes all necessary parts and comes assembled! The exhaust valve has been upgraded to stainless steel (21-4N material)


Installation Note:

It will save a lot of time and effort if the oil pump is installed while installing the bore kit (requires cylinder removal).
See the Performance Info section for additional information on our performance parts.


Replacement Parts:




TBW0750 - V2 race head
TBW0755 - V2 bolt kit
TBW0752 - V2 race camshaft
TBW0754 - V2 head cover set
TBW0753 - Piston
TBW0859 - V2 head gasket kit
TBW0156 - Cylinder